Re-enable SRML tests

[AdamRJensen]

The SRML tests were disabled in #1921 as the SRML website is currently undergoing extensive maintenance.

This issue shall serve as a reminder to re-enable the SRML tests when the website is up and running again.

[AdamRJensen]

The SRML website has changed from solardat.uoregon.edu to solardata.uoregon.edu. Thus, the get_srml function is currently not working. I am waiting to correct this issue, as there is a good possibility that the file structure will change in the near future. In the meantime, it's possible to get data by changing the URL in the get_srml function, as shown below:

    df, meta = pvlib.iotools.get_srml(
        station='HE',
        start='2020-06-01',
        end='2020-06-30',
        url='http://solardata.uoregon.edu/download/Archive/')